【摘要】 上游高氯废水进入污水场,经污水处理系统处理后,出水氯离子质量浓度在3000～5000mg/L之间,由于氯离子的干扰,采用GB11914—1989分析法测定化学需氧量值误差较大,且误差随着氯离子浓度的增加而增大。为了消除氯离子的干扰,采用完全氧化法测定其相当的化学需氧量的值,做化学需氧量-氯离子的校准曲线,用测定水样总的化学需氧量值,减去氯离子理论产生的化学需氧量值,得到污水处理场出水的真实化学需氧量。经标准样品测试标准偏差在0.9～2.5之间,实际样品的相对标准偏为2.8%,加标回收率在95.2%～105%之间,说明方法准确可靠,消除氯离子的干扰效果好。更多还原

【Abstract】 Upstream high chlorine wastewater enters the wastewater treatment plant. After treatment by the wastewater treatment system,the concentration of chloride ion in the effluent is between 3000-5000 mg/L.Due to the interference of chloride ion,the error of COD determination by GB11914-89 analysis method is larger,and the error increases with the increase of chloride ion concentration.In order to eliminate the interference of chloride ion,the equivalent chemical oxygen demand(COD)was determined by complete oxidation method,and the calibration curve of COD-Cl ion was made. The total COD of water sample was measured,and the actual COD of effluent from sewage treatment plant was obtained by subtracting the COD from the theory of chloride ion.The standard deviation of standard sample is between 0.9 and 2.5,and the relative standard deviation of actual sample is 2.8%. The recovery of standard addition is between 95.2 and 105%. It shows that the method is accurate and reliable,and the interference of chloride ion is eliminated effectively.更多还原